html,body{
	height: 100%;
}
#app{
	height: 100%;
	width: 100%;
	display: flex;
	flex-direction: column;
	
}
header,footer{
	 height: 46px; 
	line-height: 46px;
	text-align: center;
	 background-color:red;
}
section{
	flex: 1;
	overflow-y: scroll;
}
footer{
	background-color:#000000;
}
#tou{
	background-color: red;
	padding-top: 20px;
	padding-bottom: 20px;
}
#icon{
	padding-top: 10px;
	height: 50px;
	background-color:red;
}